mongodb/jstests/core/compact_keeps_indexes.js

// SERVER-16676 Make sure compact doesn't leave the collection with bad indexes
// SERVER-16967 Make sure compact doesn't crash while collections are being dropped
// in a different database.
// @tags: [
//   # compact command is not available on embedded
//   incompatible_with_embedded,
//   uses_multiple_connections,
// ]

(function() {
    'use strict';

    var coll = db.compact_keeps_indexes;

    coll.drop();
    coll.insert({_id: 1, x: 1});
    coll.ensureIndex({x: 1});

    assert.eq(coll.getIndexes().length, 2);

    // force:true is for replset passthroughs
    var res = coll.runCommand('compact', {force: true});
    // Some storage engines (for example, inMemoryExperiment) do not support the compact command.
    if (res.code == 115) {  // CommandNotSupported
        return;
    }
    assert.commandWorked(res);

    assert.eq(coll.getIndexes().length, 2);
    assert.eq(coll.find({_id: 1}).itcount(), 1);
    assert.eq(coll.find({x: 1}).itcount(), 1);

    var dropCollectionShell = startParallelShell(function() {
        var t = db.getSiblingDB('test_compact_keeps_indexes_drop').testcoll;
        t.drop();
        for (var i = 0; i < 100; i++) {
            t.save({a: 1});
            t.drop();
        }
    });
    for (var i = 0; i < 10; i++) {
        coll.runCommand('compact');
    }
    dropCollectionShell();

}());